Re: [PATCH v2] Fixed integer overflow in e1000e

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 3/4/20 3:20 PM, andrew@daynix.com wrote:
> From: Andrew Melnychenko <andrew@daynix.com>
> 
> Fixes: 6f3fbe4ed06
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1737400
> Fixed setting max_queue_num if there are no peers in NICConf. qemu_new_nic() creates NICState with 1 NetClientState(index 0) without peers, set max_queue_num to 0 - It prevents undefined behavior and possible crashes, especially during pcie hotplug.

Hoping the maintainer taking this can reformat the commit description a 
bit nicer... (moving the tags down), then for the code part:
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> 
> Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
> ---
>   hw/net/e1000e.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/net/e1000e.c b/hw/net/e1000e.c
> index a91dbdca3c..f2cc1552c5 100644
> --- a/hw/net/e1000e.c
> +++ b/hw/net/e1000e.c
> @@ -328,7 +328,7 @@ e1000e_init_net_peer(E1000EState *s, PCIDevice *pci_dev, uint8_t *macaddr)
>       s->nic = qemu_new_nic(&net_e1000e_info, &s->conf,
>           object_get_typename(OBJECT(s)), dev->id, s);
>   
> -    s->core.max_queue_num = s->conf.peers.queues - 1;
> +    s->core.max_queue_num = s->conf.peers.queues ? s->conf.peers.queues - 1 : 0;
>   
>       trace_e1000e_mac_set_permanent(MAC_ARG(macaddr));
>       memcpy(s->core.permanent_mac, macaddr, sizeof(s->core.permanent_mac));
>